Improvement in compound steam-pumps



UNITED STATES ARTHUR J. L. LORETZ, OF BROOKLYN, NEW YORK.

IMPROVEMENT IN COMPOUND STEAM-PUMPS.

Specification forming part of Letters Patent No. 139,070, dated May 20, 1873; application filed July 22, 1872.

To all whom it may concern:

Be it known that I, ARTHUR J. L. LORETZ, of Brooklyn, in the county of Kings and State of New York, have invented a Compound Steam-Pump,of which the following is a specification:

My invention consists of two vertical compound high and low pressure steam-cylinders, A and B, connected at opposite strokes, by cranks 1 and 2, to the shaft S of the fly-wheel W. Each cylinder has a small steam-chest, D, cast on, containing a plain flat slide-valve, H, said valve being connected to an eccentric, E, on fly-wheel shaft S, the eccentric havin g sufficient throw, so as to cut off steam at one-fiith 0f the stroke-in the annular space O. P is a valve, which, when seated, forms the piston for the annular space 0, as in cylinder B, and when open, as in cylinder A, allows the steam to pass through into the low-pressure-cylinderportion L; the periphery of valve P having grooves turned in it for packing, or fitted with steam-pressure rings, the latter being preferable on account of relieving the friction when the pressure is off. The periphery is also of sufficient width of face, so that, when it reaches the end of the up or down stroke, it will project sufficiently at O and O to strike the cylinder-head M and bottom projection N, opening and closing the valve alternately. The lower part A and B of the steam-cylinders A and B forms the pump,the plunger K being a continuation of the resulting difi'erence in area between the high and low pressure steam-cylinders. The plunger K has a passage, R, passing through its center, provided with a valve, U, through which the remaining vapor passes from the low-pressure-cylinder portion L into the pump on the upstroke, as in cylinder B, where the vapor comes in contact with the column of water entering the pump-chamber through the valve G. The plunger K is cast hollow, as represented at X, and is filled with plaster of Paris, and made long enough, so that the periphery of the plunger which is brought in contact with the water, will not come in contact with the steam. Q are the delivery-valves, through which the water is delivered to the atmosphere. Z is a cross-bar, fitted to lower part of plunger K, which acts as a guard for valve U, and through which the piston-rod J passes, and

secured thereto by a nut which bears against said bar, holding the whole arrangement of the plunger together.

The operation of the pump is thus: Supposing the plunger of one of the cylinders to be on the down-stroke, that of the other will be at the extreme upstroke. The slide-valve H in the cylinder, being at the down-stroke, opens; the steam enters the annular space 0 with a pressure of fifty pounds per square inch, including that of the atmosphere. The steam being cut off at one-fifth will expand five times in the high-pressure cylinder portion; the piston or valve P having arrived at the upstroke will have struck the head M with projection 0 opening a communication between the cylinder portion 0 and L. Now, the area ofL being three times that of 0, onethird of L will remain in equilibrium with C, while the remaining two-thirds will be acted upon by the expanding steam. Again, while the cylinder is thus expanding the steam in the down-stroke, as at A, the plunger K, with the valve U closed, is delivering the water in pump-chamber A through valve Q, to the atmosphere; the valve U being kept closed by the pressure of the atmosphere, the initial and average pressure in cylinder portion L being below it. Again, while the plunger is in this course, as at A, the other is moving on the upstroke with high-pressure steam in cylinder portion O, as at B, the valve U being open,

having dropped down upon the guard Z, the valve not being acted upon by the atmosphere, thus allowing the expanded vapor to pass into the pump portion B where it is condensed. by the water entering through valve G, being forced in by the pressure of the atmosphere. Having thus a vacuum on one side of the piston P in cylinder portion L, we get the full power of the steam in cylinder portion 0. The two cylinders beingconnected at opposite strokes, the cylinder B lends its power to cyl inder A while delivering its water to the atmosphere, and so vice versa. The volume of steam let in at each stroke being expanded fifteen times, there is almost a perfect vacuum before the valve U opens; the average press- OFFICE.

ure, in this instance, being just sulficient to deliver the Water to the atmosphere after hein g lifted thirty feet.

H Ving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the cylindrical pumpchambcrs A and 13 steam-chambers A and B with the hollow plunger K, high-pressure compartments 0 O, and low-pressure compartments L L, arranged substantially as shown, and for the purpose set forth.

2. The combination of valves P and U and hollow plunger K with the chambers B B constructed-and arranged for operation substantially as shown, and for the purpose set forth.

3. The combination of the chambers A A B B forming compartments L L C C, the plungers K, and valves P U with inlet-valves G and outlet-valves Q, all arranged as and for the purpose set forth.

ARTHUR J. L. LORETZ.

Witnesses:

WALTER NroHoLs, WM. BURDON. 

